Cost is roughly proportional to total indirect energy consumption, pollution, and CO2 emissions. If green energy costs more, it has a bigger carbon footprint somewhere. To find out where, simply follow the money, all the way to China.
Money is really just an abstract representation of energy. Spending money is the same thing as consuming energy in proportion to the price. The average price of an ounce of gold reflects the average energy needed to find, mine, and market it. If government makes energy more expensive, the price of gold goes up, and the quality of life goes down.
Good analysis. Congratulations!